One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10,14,11)(12,15,16,13)(17,18,22,26)(19,23,24,32)(20,29,30,28)(21,27,31,25)(2,5)(6,7)(9,11)(10,14)(12,15)(13,16)(17,19)(18,23)(20,27)(21,28)(22,24)(25,30)(26,32)(29,31) involution — undirected(9,12,13,10,14,16,15,11)(17,20,21,23,22,30,31,32)(18,24,25,29,26,19,27,28)(1,3,4,8)(2,6,5,7)(9,13,14,15)(10,16,11,12)(19,24)(20,30)(23,32)(28,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.